Solve 10x − 15 = 185

The solution of 10x − 15 = 185 is x = 20.

10x - 15 = 185\ \Rightarrow\ x = 20

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The lines y = 10x − 15 and y = 185 meet at x = 20. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$10x - 15 = 185$
2
Add 15 to both sides:
$10x - 15 + 15 = 185 + 15 \ \Rightarrow\ 10x = 200$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{200}{10} \ \Rightarrow\ x = 20$
4
Check: put x = 20 back into the equation.
$10\cdot20 - 15 = 200 - 15 = 185 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 15 = 185\ \Rightarrow\ x = 20 \]
\[ 10x - 15 = 185 \]
\[ 10x - 15 + 15 = 185 + 15 \ \Rightarrow\ 10x = 200 \]
\[ \frac{10x}{10} = \frac{200}{10} \ \Rightarrow\ x = 20 \]
\[ 10\cdot20 - 15 = 200 - 15 = 185 \checkmark \]

Trying values of x in 10x − 15 = 185

x	10x − 15	Equals 185?
18	165	no
19	175	no
20	185	yes
21	195	no
22	205	no

Questions

What is x in 10x − 15 = 185?

The solution of 10x − 15 = 185 is x = 20.

How do you solve 10x − 15 = 185?

Add 15 to both sides to get 10x = 200, then divide both sides by 10 to get x = 20.

How do I check the answer?

Replace x by 20: 10(20) − 15 = 185, which is 185.

Solve 10x − 15 = 185

How to work it out

Trying values of x in 10x − 15 = 185

Questions

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